CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
EPSS
Percentile
60.6%
IBM Cloud Kubernetes Service is affected by a security vulnerability in the Kubernetes API server that enables a user to bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers with the kubernetes.io/enforce-mountable-secrets annotation (CVE-2023-2728).
CVEID: CVE-2023-2728
Description: Kubernetes could allow a remote authenticated attacker to bypass security restrictions, caused by a flaw when the ServiceAccount admission plugin and the kubernetes.io/enforce-mountable-secrets annotation are used together with ephemeral containers. By sending a specially crafted request, an attacker could exploit this vulnerability to bypass the mountable secrets policy to launch containers.
CVSS Base Score: 6.5
CVSS Temporal Score: <https://exchange.xforce.ibmcloud.com/vulnerabilities/259627> for more information
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N)
IBM Cloud Kubernetes Service 1.27.0-1.27.2
IBM Cloud Kubernetes Service 1.26.0-1.26.5
IBM Cloud Kubernetes Service 1.25.0-1.25.10
IBM Cloud Kubernetes Service 1.24.0-1.24.14
IBM Cloud Kubernetes Service 1.5-1.23
Updates for IBM Cloud Kubernetes Service clusters at version 1.24 or later are available that fix this vulnerability. IBM Cloud Kubernetes Service will attempt to automatically apply the fix to your cluster master. There is no need to update cluster worker nodes for this vulnerability.
To verify your clusters are no longer exposed to this vulnerability, use the following IBM Cloud CLI command to confirm your cluster master versions:
ibmcloud ks clusters
If your cluster masters are at one of the following versions or later, they are no longer exposed to this vulnerability:
1.27.3_1529
1.26.6_1541
1.25.11_1549
1.24.15_1573
If one or more of your clusters has not had its master automatically updated then use the following IBM Cloud CLI command to complete the cluster master update, replacing 1.##
with the target version.
ibmcloud ks cluster master update --cluster <cluster name or ID> --version 1.##
Customers running IBM Cloud Kubernetes Service clusters at version 1.23 must upgrade to version 1.24. Please review the documentation before starting an upgrade since additional actions may be required.
Customers running IBM Cloud Kubernetes Service clusters at version 1.22 or earlier must create a new cluster and deploy their apps to the new cluster.
IBM Cloud Kubernetes Service versions 1.23 and earlier are no longer supported. See the IBM Cloud Kubernetes Service version information and update actions documentation for more information about Kubernetes versions and version support policies.
Monitor the security notifications on the IBM Cloud Status page to be advised of future security bulletins.
Complete CVSS v3 Guide
On-line Calculator v3
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Kubernetes: Admission Controllers Reference
IBM Cloud Kubernetes Service: Default service settings for Kubernetes components
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
IBM Cloud Kubernetes Service does not enable the ImagePolicyWebhook
admission controller so is not vulnerable to CVE-2023-2727
.
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
[{“Business Unit”:{“code”:“BU059”,“label”:“IBM Software w/o TPS”},“Product”:{“code”:“SSJTBP”,“label”:“IBM Cloud Kubernetes Service and Red Hat OpenShift on IBM Cloud”},“Component”:“–”,“Platform”:[{“code”:“PF025”,“label”:“Platform Independent”}],“Version”:“All Versions”,“Edition”:“”,“Line of Business”:{“code”:“LOB21”,“label”:“Public Cloud Platform”}}]
IKS;
Vendor | Product | Version | CPE |
---|---|---|---|
ibm | ibm_cloud_kubernetes_service_and_red_hat_openshift_on_ibm_cloud | any | cpe:2.3:a:ibm:ibm_cloud_kubernetes_service_and_red_hat_openshift_on_ibm_cloud:any:*:*:*:*:*:*:* |
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
EPSS
Percentile
60.6%